It takes considerable software effort to optimize the code enough to run on HW3. It also needs to be validated separately. Additionally, Musk has said that v12.5 has five times as many parameters as v12.4, which will be able to be run on HW3 vehicles with some extra work on the code.
Cybertruck owners are also waiting to get the software. In an interview last weekend, Musk said that he expected FSD v12.5 to go out to Cybertrucks in two to four weeks. Along with the Cybertruck getting FSD for the first time, v12.5 is expected to include a number of improvements.
FSD v12.5 is focused on both Model Y units with HW4 initially, with plans to expand to HW3. Ashok Elluswamy highlighted the team's focus on smoothness and safety during development.
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